18. Look at the figures A, B and C carefully and answer
the questions which follow : [ICSE 1997, 2005]
(1) Which kind of blood vessel is shown in A ? Write
any two characteristics of such blood vessels.
(ii) Name two kinds of blood cells shown in A.
(iii) Describe step by step what is happening in the
three figures. What is the advantage of this
activity to our body?
Answers
Explanation:
1. Capillaries are the blood vessels shown in the above figure. These are the very thin walled blood vessel found at the junction between artery and veins. Capillaries helps in quick exchange of materials between blood and body
tissues.
2. RBC and WBC the two kinds of blood cells shown in A.
3. In the figure a the WBC is squeezing out through the walls of capillary at the site of injury. In the figures b the WBC that has squeezed out through the walls of capillaries is moving towards the foreign bodies to engulf it. In the figure b the wbc has engulfed the foreign body thus protecting our body from its harmful effect.
Answer:
1. Capillaries are the blood vessels shown in the above figure. These are the very thin walled blood vessel found at the junction between artery and veins. Capillaries helps in quick exchange of materials between blood and body
tissues.
2. RBC and WBC the two kinds of blood cells shown in A.
3. In the figure a the WBC is squeezing out through the walls of capillary at the site of injury. In the figures b the WBC that has squeezed out through the walls of capillaries is moving towards the foreign bodies to engulf it. In the figure b the wbc has engulfed the foreign body thus protecting our body from its harmful effect.
Explanation:
1. Capillaries are the blood vessels shown in the above figure. These are the very thin walled blood vessel found at the junction between artery and veins. Capillaries helps in quick exchange of materials between blood and body
tissues.
2. RBC and WBC the two kinds of blood cells shown in A.
3. In the figure a the WBC is squeezing out through the walls of capillary at the site of injury. In the figures b the WBC that has squeezed out through the walls of capillaries is moving towards the foreign bodies to engulf it. In the figure b the wbc has engulfed the foreign body thus protecting our body from its harmful effect.